package com.hud.easynavi;

import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class SerialPort {
	// 串口对象
	private FileDescriptor mFd = null;
	private FileInputStream mFileInputStream = null;
	private FileOutputStream mFileOutputStream = null;

	// 构造函数
	public SerialPort(File device, int baudrate, int flags) throws SecurityException, IOException {
		// 判断权限
		if (!device.canRead() || !device.canWrite()) {
			try {
				Process su = Runtime.getRuntime().exec("/system/bin/su");
				String cmd = "chmod 666 " + device.getAbsolutePath() + "\n" + "exit\n";
				su.getOutputStream().write(cmd.getBytes());
				if ((su.waitFor() != 0) || !device.canRead() || !device.canWrite()) {
					throw new SecurityException();
				}
			} catch (Exception e) {
				e.printStackTrace();
				throw new SecurityException();
			}
		}
		// 打开串口
		
		mFd = open(device.getAbsolutePath(), baudrate, flags);
		if (mFd == null) {
			throw new IOException();
		}
		mFileInputStream = new FileInputStream(mFd);
		mFileOutputStream = new FileOutputStream(mFd);
	}

	// 获取输入流
	public InputStream getInputStream() {
		return mFileInputStream;
	}

	// 获取输出流
	public OutputStream getOutputStream() {
		return mFileOutputStream;
	}

	// 串口类
	public native static FileDescriptor open(String path, int baudrate, int flags);

	public native void close();

	static {
		System.loadLibrary("serialport");
	}
}
